PT81651B - Processo para a transmissao telefonica analogica por radio - Google Patents
Processo para a transmissao telefonica analogica por radio Download PDFInfo
- Publication number
- PT81651B PT81651B PT81651A PT8165185A PT81651B PT 81651 B PT81651 B PT 81651B PT 81651 A PT81651 A PT 81651A PT 8165185 A PT8165185 A PT 8165185A PT 81651 B PT81651 B PT 81651B
- Authority
- PT
- Portugal
- Prior art keywords
- acoustic frequency
- frequency
- telephone signal
- acoustic
- pulses
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 11
- 238000001514 detection method Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000003595 spectral effect Effects 0.000 claims 1
- 230000008595 infiltration Effects 0.000 abstract 1
- 238000001764 infiltration Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
Landscapes
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Engineering & Computer Science (AREA)
- Mobile Radio Communication Systems (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Transmitters (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Transceivers (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Developing Agents For Electrophotography (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Toys (AREA)
- Radio Transmission System (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3445312 | 1984-12-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| PT81651A PT81651A (pt) | 1986-06-11 |
| PT81651B true PT81651B (pt) | 1994-07-29 |
Family
ID=6252587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PT81651A PT81651B (pt) | 1984-12-12 | 1985-12-11 | Processo para a transmissao telefonica analogica por radio |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0184811B1 (enrdf_load_html_response) |
| AT (1) | ATE61503T1 (enrdf_load_html_response) |
| DE (1) | DE3582023D1 (enrdf_load_html_response) |
| ES (1) | ES8701442A1 (enrdf_load_html_response) |
| FI (1) | FI79216C (enrdf_load_html_response) |
| IN (1) | IN163475B (enrdf_load_html_response) |
| NO (1) | NO166308C (enrdf_load_html_response) |
| PT (1) | PT81651B (enrdf_load_html_response) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10016133C2 (de) * | 2000-03-31 | 2002-06-20 | Siemens Ag | Verfahren zum Sichern einer berührungslosen Signalübertragung von einem Sender zu einem Empfänger sowie Signalübertragungseinrichtung |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE521991C (de) * | 1928-08-17 | 1931-03-28 | Telefunken Gmbh | Verfahren zur geheimen UEbermittlung í¬ insbesondere von Telephoniestroemen í¬ mittels modulierter Hochfrequenz |
| CH559483A5 (enrdf_load_html_response) * | 1973-06-12 | 1975-02-28 | Patelhold Patentverwertung | |
| DE2952158A1 (de) * | 1979-12-22 | 1981-06-25 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Funk-nachrichtenuebertragungsverfahren mit begrenzten, insbesondere sehr kurzen sendezeiten und empfaenger hierfuer |
| DE3012513C2 (de) * | 1980-03-31 | 1984-04-26 | Siemens AG, 1000 Berlin und 8000 München | Verfahren zur Überwachung analoger und digitaler Funkverbindungen |
| JPS58198934A (ja) * | 1982-05-17 | 1983-11-19 | Sony Corp | 秘話装置 |
| GB2128453A (en) * | 1982-10-08 | 1984-04-26 | Philips Electronic Associated | System identification in communications systems |
-
1985
- 1985-11-04 IN IN779/CAL/85A patent/IN163475B/en unknown
- 1985-12-09 AT AT85115658T patent/ATE61503T1/de not_active IP Right Cessation
- 1985-12-09 EP EP85115658A patent/EP0184811B1/de not_active Expired - Lifetime
- 1985-12-09 DE DE8585115658T patent/DE3582023D1/de not_active Expired - Lifetime
- 1985-12-11 PT PT81651A patent/PT81651B/pt active IP Right Grant
- 1985-12-11 FI FI854900A patent/FI79216C/fi not_active IP Right Cessation
- 1985-12-12 NO NO855007A patent/NO166308C/no unknown
- 1985-12-12 ES ES549878A patent/ES8701442A1/es not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0184811B1 (de) | 1991-03-06 |
| FI854900L (fi) | 1986-06-13 |
| EP0184811A2 (de) | 1986-06-18 |
| ES549878A0 (es) | 1986-11-16 |
| NO166308C (no) | 1991-06-26 |
| DE3582023D1 (de) | 1991-04-11 |
| PT81651A (pt) | 1986-06-11 |
| FI79216B (fi) | 1989-07-31 |
| FI79216C (fi) | 1989-11-10 |
| FI854900A0 (fi) | 1985-12-11 |
| EP0184811A3 (en) | 1988-01-13 |
| NO855007L (no) | 1986-06-13 |
| ES8701442A1 (es) | 1986-11-16 |
| ATE61503T1 (de) | 1991-03-15 |
| IN163475B (enrdf_load_html_response) | 1988-10-01 |
| NO166308B (no) | 1991-03-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FG3A | Patent granted, date of granting |
Effective date: 19940105 |